Liquid Electrophotography Fabric Transfer via Temperature Control
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Solution Overview
Problem
Liquid electrophotography printing devices struggle to print on textiles as the evaporation of carrier fluids in the printing fluid causes the ink to become tacky and fail to penetrate into fabric fibers, leading to cracking and peeling of the printed image.
Innovation Solution
A liquid electrophotographic printing device with a transfer roller heated to a lower temperature (70° to 95° Celsius) to maintain a significant portion of the carrier fluid in the printing fluid, allowing it to penetrate into fabric fibers, and an adjustable system to accommodate different fabric types for optimal printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transfer roller is heated to high temperature (100° to 150° Celsius) to evaporate carrier fluid and make printing fluid tacky for paper transfer, then the printing fluid becomes tacky and transfers well onto paper, but the printing fluid fails to penetrate into fabric fibers and causes cracking and peeling
Solution Approach 1:
The patent applies parameter changes by adjusting the transfer roller temperature from the conventional 100°-150° Celsius range down to 50°-90° Celsius. This temperature parameter modification prevents complete carrier fluid evaporation, maintaining sufficient fluidity and penetration capability while still enabling effective transfer to fabric substrates, thereby eliminating cracking and peeling issues
Solution Approach 2:
The patent implements dynamics by making the transfer roller temperature adjustable and adaptable to different substrate types. The system can dynamically modify operating parameters based on whether printing on paper or fabric, allowing optimal temperature selection for each substrate type to achieve reliable transfer without damage
2Reliability
If the carrier fluid is completely evaporated to make printing fluid tacky, then transfer onto paper is achieved, but penetration into fabric fibers is prevented
Solution Approach 1:
The patent applies partial action by preventing complete evaporation of the carrier fluid. Instead of removing all carrier fluid to achieve tackiness, the system allows partial evaporation that maintains sufficient carrier fluid content (0.1%-10% remaining) to enable both transfer effectiveness and fabric fiber penetration
Solution Approach 2:
The patent modifies the carrier fluid content parameter by controlling temperature and exposure time to achieve optimal remaining carrier fluid levels. This parameter adjustment ensures the printing fluid maintains appropriate viscosity and penetration capability while still transferring effectively to the substrate
3Manufacturing precision
If high temperature heating is used to evaporate carrier fluid, then printing fluid becomes tacky for transfer, but fabric fiber penetration is blocked
Solution Approach 1:
The patent applies parameter changes by establishing a new temperature range (50°-90° Celsius) that balances transfer precision with penetration capability. This temperature parameter optimization allows the printing fluid to become sufficiently tacky for accurate transfer while maintaining fluidity for fabric fiber penetration
Solution Approach 2:
The patent adapts the transfer process by creating a modified version suitable for fabric substrates. Instead of directly applying the paper-optimized high-temperature process, it creates a adapted low-temperature process that achieves similar transfer quality while adding penetration capability for fabric applications
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables direct textile printing by embedding the printing fluid into fabric fibers, preventing flaking or peeling and allowing for flexible and durable images, while also reducing costs by eliminating the need for pre-transfer media.
Implementation Method 1
a transfer roller to receive an amount of printing fluid from a photo imaging plate and transfer the printing fluid to a fabric while preventing the evaporation of a carrier fluid within the printing fluid
Implementation Method 2
transfer the printing fluid to a fabric while preventing the evaporation of a carrier fluid within the printing fluid
Implementation Method 3
allowing the printing fluid to penetrate into fabric fibers
Implementation Method 4
penetrate into fabric fibers
Data Source
AI summary
A liquid electrophotographic (LEP) printing device that includes a photo-imaging plate (PIP) to receive a liquid printing fluid, the liquid printing fluid including a pigment incorporated into a resin, a charge conductor, and a carrier liquid, and a transfer roller to transfer the liquid printing fluid from the PIP to a fabric substrate while wet.